T(n,k) = Number of n X k nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

A208021

T(n,k) = Number of n X k nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =2a(6) =5a(7) =7a(8) =7a(9) =5a(10) =15a(11) =87a(12) =270a(13) =87a(14) =15a(15) =52a(16) =1657a(17) =27093a(18) =27093a(19) =1657a(20) =52a(21) =203a(22) =43833a(23) =5252041a(24) =30066912a(25) =5252041a(26) =43833a(27) =203a(28) =877a(29) =1515903

External references